Centering-tool



J. R. PARKS.

CENTERING TOOL.

APPLICATION FILED APR.3,19I8.

Patented July 15, 1919.

'mu COLUMBIA PLANOOHAPII cm, WASHINGTON. l7- c.

. JOHN RUSSELL PARKS, OF FRANKLINVILLE, NORTH CAROLINA.

CENTERING-TOOL.

Application filed April 3, 1918.

To all whom it may concern:

Be it known that I, JOHN RUSSELL PARKS, a citizen of the United States, and a resident of Franklinville, in the county of Bandolph and State of North Carolina, have invented certain new and useful Improvements in CenteringTools, of which the following is a specification.

This invention relates to centering de. vices, and one of the objects is to provide means whereby the device may be quickly and effectually centered.

Another object of the invention is to pro vide a device of the class described, in which the liability of the parts becoming disarranged or rendered unfit for use in service will be reduced to a minimum, if not wholly avoided,

Other objects and advantages of the invention will be referred to hereinafter, it being understood that changes in form, pro portion and minor details of construction may be resorted to without departing from the spirit of the invention or sacrificing any of its advantages.

In the drawings:

Figure 1 is a perspective view of a centering device, constructed in accordance with my invention.

Fig. 2 is a cross-sectional View on the line 22 of Fig. 1.

Fig. 3 is a cross-sectional view on the line 3-3 of Fig. 1.

Fig. i is a cross-sectional view on the line 4l4 of Fig. 1. j

Fig. 5 is a fragmentary perspective view of a slightly modified form of jaw-attaching device; and

Fig. 6 is a detailed view of the punch.

Referring now to the drawings by numerals of reference, 1 designates a guide bar having intermediate its ends, an OUtStitIlCling pivot or journal 2, adapted to receive a swinging head 3, having oppositely disposed actuating arms 4 and 5, which are connected to the jaws 6 and 7 by links 8 and 9. The links 8 and 9 are curved in opposite directions to give clearance when the device is adjusted to a small diameter, the curva- Specification of Letters Patent.

Patented July 15, 1919.

Serial No. 226,364.

ture allows the cross-piece more leeway and brings the jaws closer to the center point, and are respectively connected to the arms 4 and 5 by the pivot members 10 and 11, and to the jaws 6 and 7 by the pivot members 12 and 13. The jaws G and 7 are preferably rectangular, and are provided with slots 14- and 1.5, through which the respective ends of the bar 1 project. The jaws may be adjusted toward and away from one another by turning the centrally located lever (consisting of the head 3 and the arms i and 5) in the proper direction. lVhen the jaws are adjusted to the proper position, they may be securely fastened in the predetermined relation by screwing the nut 10 on the threaded portion 17 of the pivot 2, to bear against, the portion 18 of the head 3 and bind the head against the bar 1. When it is desired to arrange the relative positions of the jaws, this can be accomplished by loosening the nut 16.

In the modified 't'orm shown in Fig, 5, the slot, as for example 14, in the jaw (5 is formed by the offset portions 19 and 20, which are somewhat thicker than the jaw (S, and which are bridged by the bar 21.

The punch 22 may be introduced through the member 2 to indicate the center point on the work.

From the foregoing it will be apparent that the centering device may be conveniently assembled and operated, and that the jaws may be held substantially rigid in any of their adjusted positions.

Claim.

In a centering device a guide bar, sliding jaws on said guide bar, a centrally located pivot on said guide bar comprising a tubular ody having exterior threads, a lever pivoted on said tubular body, means for connecting the lever to the jaws, and a nut on the tubular body, and adapted to exert pressure against the lever to bind it to the bar..

v The foregoing specification signed at l ranklinv ille, N. 0., this 23d day of March, 1918.

JOHN RUSSELL PARKS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. c. 

